:root{--color-brand: #028560;--color-brand-strong: #026b4e;--color-brand-tint: #d9f0e9;--color-brand-faint: #b5ddd0;--color-bg-default: #f1f5f7;--color-bg-success: #d9f0e9;--color-bg-error: #fff0f0;--color-bg-warning: #fcf8e8;--color-surface: #ffffff;--color-border: #e5e5e5;--color-text: #333333;--color-text-secondary: #333333;--color-text-muted: #737373;--color-success: #028560;--color-error: #b71518;--color-warning: #a16207;--color-info: #0b6e99;--color-audio-active: var(--color-brand);--color-weakpoint: #b71518;--font-ja: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;--font-en: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Inter", sans-serif;--font-num: var(--font-en);--text-xs: 12px;--text-sm: 14px;--text-base: 16px;--text-lg: 18px;--text-xl: 20px;--text-2xl: 28px;--text-hero: 34px;--text-num: 40px;--leading-ja: 1.5;--leading-en: 1.4;--leading-tight: 1.2;--weight-regular: 300;--weight-medium: 500;--weight-bold: 700;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-6: 24px;--space-8: 32px;--space-12: 40px;--space-16: 64px;--radius-sm: 10px;--radius-md: 14px;--radius-full: 9999px;--border-width: 1px;--shadow-card: none;--container-max: 430px;--header-height: 44px;--button-height: 50px;--duration-fast: .15s;--duration-base: .25s;--duration-slow: .5s;--ease-standard: cubic-bezier(.4, 0, .2, 1);--ease-spring: cubic-bezier(.32, .72, 0, 1)}:root{--ink: var(--color-text);--ink-2: var(--color-text-secondary);--muted: var(--color-text-muted);--line: var(--color-border);--paper: var(--color-bg-default);--paper-2: #e5e5e5;--pink: var(--color-brand);--pink-50: var(--color-brand-tint);--pink-100: var(--color-brand-tint);--pink-dark: var(--color-brand-strong);--coral: var(--color-error);--indigo: var(--color-text);--gold: var(--color-brand);--gold-dark: var(--color-brand-strong);--green: var(--color-success);--green-dark: var(--color-brand-strong);--shadow: var(--shadow-card);--radius: var(--radius-md);--font-sans: var(--font-ja);--font-display: var(--font-ja);--font-handwritten-jp: var(--font-ja);--font-handwritten-en: var(--font-ja);--color-bg: var(--color-bg-default);--color-surface-soft: var(--color-bg-default);--color-text-soft: var(--color-text-secondary);--color-primary: var(--color-brand);--color-primary-strong: var(--color-brand-strong);--color-accent: var(--color-brand);--color-positive: var(--color-success);--text-meta: 14px;--text-body: 14px;--text-control: 14px;--text-subtitle: 16px;--text-title: 20px;--text-display: 28px;--weight-semibold: 500;--weight-heavy: 700;--leading-snug: 1.4;--leading-body: 1.5;--tracking-tight: -.015em;--tracking-label: .02em;--space-5: 16px;--control-height-sm: 32px;--control-height-md: 40px;--control-height-lg: 50px;--control-radius-sm: var(--radius-sm);--control-radius: var(--radius-sm);--radius-card: var(--radius-md);--radius-panel: var(--radius-md);--radius-pill: var(--radius-full);--shadow-control: var(--shadow-card);--focus-ring: none;--motion-fast: var(--duration-fast) var(--ease-standard)}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%;overscroll-behavior:none}body{font-family:var(--font-sans);color:var(--ink);background:var(--paper);line-height:var(--leading-ja);font-feature-settings:"palt";-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;border:0;padding:0;background:transparent;color:inherit}input,textarea,select{font-size:16px}.audio-orb,.roy-mascot,.bottom-nav .tab.elevated .ico,.bottom-nav .tab .ico .ico-img,.hint-btn,.vibe-thanks-check{flex-shrink:0;aspect-ratio:1 / 1}a{color:var(--pink)}.app-shell{min-height:100dvh;display:flex;flex-direction:column;align-items:center;background:var(--color-bg-default)}.app-frame{width:100%;max-width:var(--container-max);height:100dvh;background:var(--color-bg-default);display:flex;flex-direction:column;position:relative;overflow:hidden}@media (min-width: 481px){.app-frame{border-left:1px solid var(--color-border);border-right:1px solid var(--color-border)}}.offline-notice{position:absolute;z-index:30;top:calc(10px + env(safe-area-inset-top));left:12px;right:12px;min-height:40px;display:flex;align-items:center;justify-content:center;padding:8px 12px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg-warning);box-shadow:var(--shadow-card);color:var(--color-warning);font-size:var(--text-xs);font-weight:var(--weight-bold);line-height:1.35;text-align:center}.env-badge{position:absolute;z-index:40;top:calc(12px + env(safe-area-inset-top));right:0;pointer-events:none;writing-mode:vertical-rl;padding:6px 2px;border-radius:6px 0 0 6px;font-size:9px;font-weight:700;letter-spacing:.08em;line-height:1;color:#fff;box-shadow:0 2px 8px #1f23303d}.env-badge--dev{background:#6b7280}.env-badge--stg{background:#d97706}.app-frame .page-scroll{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;padding:14px 16px 90px;display:flex;flex-direction:column;gap:12px;background:var(--paper)}.app-frame.frame-immersive .page-scroll{padding-bottom:calc(20px + env(safe-area-inset-bottom))}.app-frame .page-scroll.page-scroll-no-topbar{padding-top:calc(20px + env(safe-area-inset-top))}.topbar{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--color-surface);border-bottom:1px solid var(--line);flex-shrink:0}.topbar .stat{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-display);font-weight:700;font-size:12px;color:var(--ink);letter-spacing:.02em;font-variant-numeric:tabular-nums}.topbar .stat.mute{color:var(--muted);font-weight:700;letter-spacing:.08em}.topbar .stat.btn{background:transparent;border:0;cursor:pointer}.topbar .spacer{flex:1}.topbar-iconbtn{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;margin:-12px 0;padding:0;background:transparent;border:0;border-radius:12px;color:var(--muted);cursor:pointer;transition:background .12s ease,color .12s ease,transform 60ms ease}.topbar-iconbtn:hover{background:var(--paper-2);color:var(--ink)}.topbar-iconbtn:active{transform:scale(.94)}.topbar-iconbtn:focus-visible{outline:1px solid var(--pink);outline-offset:2px}.topbar-iconbtn+.topbar-iconbtn{margin-left:4px}.confirm-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#1f233073;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);display:grid;place-items:center;z-index:1000;padding:24px;animation:confirm-fade .16s ease}.confirm-card{background:var(--color-surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:22px 20px 18px;width:100%;max-width:340px;box-shadow:var(--shadow-card);animation:confirm-pop var(--duration-base) var(--ease-spring)}.confirm-eyebrow{font-size:10px;letter-spacing:.18em;color:var(--coral);font-weight:700;margin-bottom:6px}.confirm-title{display:block;font-family:var(--font-display);font-size:16px;font-weight:700;color:var(--ink);letter-spacing:.02em;line-height:1.4}.confirm-message{margin:8px 0 0;font-size:13px;line-height:1.65;color:var(--muted);white-space:pre-line}.confirm-message.theme-context-message{font-size:16px;font-weight:700;line-height:1.55;color:var(--ink)}.confirm-actions{display:flex;flex-direction:column;gap:8px;margin-top:18px}.confirm-actions .duo-btn{width:100%;margin:0}@keyframes confirm-fade{0%{opacity:0}to{opacity:1}}@keyframes confirm-pop{0%{opacity:0;transform:scale(.94) translateY(4px)}to{opacity:1;transform:scale(1) translateY(0)}}.duo-bar{flex:1;height:8px;background:var(--paper-2);border-radius:var(--radius-full);overflow:hidden}.duo-bar>i{display:block;height:100%;background:var(--pink)}.roy-mascot{flex-shrink:0;border-radius:50%;border:1px solid var(--color-border);background:#fff;display:grid;place-items:center;overflow:hidden;-webkit-user-select:none;user-select:none}.roy-mascot img{width:100%;height:100%;display:block;pointer-events:none}.roy-mascot.sm{width:36px;height:36px;font-size:14px}.roy-mascot.big{width:88px;height:88px;border:1px solid white;box-shadow:var(--shadow-card);font-size:28px;margin:4px auto 0}.roy-say{background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px 14px;font-size:13px;line-height:1.55;color:var(--ink);position:relative}.roy-say:before{content:"";position:absolute;top:14px;left:-9px;width:14px;height:14px;background:#fff;border-left:1px solid var(--line);border-top:1px solid var(--line);transform:rotate(-45deg)}.roy-note{background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px 16px;font-size:13px;line-height:1.55;color:var(--ink)}.roy-row{display:flex;gap:10px;align-items:flex-start}.roy-row .roy-say{flex:1}.duo-card{background:var(--color-surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:12px 14px;box-shadow:var(--shadow-card);font-size:13px;line-height:1.55;color:var(--ink-2)}.duo-card.gold{border-color:var(--color-border)}.duo-card.pink{background:var(--pink-50);border-color:var(--color-border);color:var(--ink)}.duo-card.muted{background:var(--paper-2);opacity:.65}.duo-card.dashed{border-style:dashed;background:var(--color-surface);box-shadow:none}.duo-card .lbl{font-family:var(--font-display);font-size:11px;color:var(--muted);font-weight:700;letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px}.duo-card.pink .lbl{color:var(--pink)}.duo-card.gold .lbl{color:var(--gold)}.duo-card b{font-size:14px;color:var(--ink);display:block}.duo-card p{margin:4px 0 0}.duo-btn{display:block;width:100%;background:var(--pink);color:#fff;font-weight:var(--weight-bold);font-size:14px;padding:14px 18px;border-radius:var(--radius-sm);text-align:center;border:0;cursor:pointer;font-family:var(--font-display);transition:opacity var(--duration-fast) var(--ease-standard)}.duo-btn:active{opacity:.6}.duo-btn.outline{background:var(--color-surface);color:var(--color-brand);border:1px solid var(--color-brand)}.duo-btn.gold{background:var(--gold);color:#fff}.duo-btn[disabled],.duo-btn:disabled{opacity:.45;cursor:not-allowed}.lesson-topbar{display:flex;align-items:center;gap:10px;padding:12px 14px;background:#fff;border-bottom:1px solid var(--line);flex-shrink:0}.lesson-iconbtn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;padding:0;background:transparent;border:0;border-radius:10px;color:var(--muted);cursor:pointer;transition:background .12s ease,color .12s ease}.lesson-iconbtn:hover{background:var(--line);color:var(--ink)}.lesson-iconbtn:active{transform:translateY(1px)}.lesson-iconbtn svg{width:20px;height:20px}.lesson-topbar .lesson-phase-title{margin:0 36px 0 0;flex:1;min-width:0;font-size:14px;color:var(--gold-dark)}.range-seek{width:100%;accent-color:var(--pink)}.seek-time{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin:-2px 0 4px;font-variant-numeric:tabular-nums}.turn-avatar{position:relative;width:38px;height:38px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;border:0;padding:0;flex-shrink:0;font-family:inherit}.turn-avatar.other{background:var(--color-brand);color:#fff}.turn-avatar.self{background:var(--color-brand-tint);color:var(--color-brand)}.turn-avatar svg{width:20px;height:20px}.turn-avatar .turn-no{position:absolute;top:-4px;right:-4px;min-width:18px;height:18px;border-radius:999px;background:#fff;color:var(--ink);font-size:10px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;padding:0 4px;box-shadow:0 1px 2px #0000001f;font-variant-numeric:tabular-nums;border:1px solid var(--paper)}.turn-avatar.is-current{outline:1px solid var(--ink);outline-offset:2px}.turn-avatar:active{transform:translateY(1px)}.chip-row{display:flex;flex-wrap:wrap;gap:14px;padding:0}.seek-time+.chip-row{margin-top:-16px}.seek-time+.chip-row.shadow-turn-grid{flex-wrap:nowrap;justify-content:center;gap:14px}.lesson-scene-bar{flex-shrink:0;padding:10px 16px 8px;background:var(--paper);border-bottom:1px solid var(--line)}.lesson-bar-bottom{flex-shrink:0;padding:10px 16px 14px;background:var(--paper);border-top:1px solid var(--line);box-shadow:0 -4px 12px #1f23300a}.lesson-scroll{flex:1;overflow-y:auto;padding:14px 16px 18px;display:flex;flex-direction:column;gap:14px;background:var(--paper)}.parallel-passage{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 4px 0 var(--line);padding:14px 16px 18px;display:flex;flex-direction:column;gap:16px;position:relative;flex:1;min-height:0;overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--line) transparent}.parallel-passage::-webkit-scrollbar{width:6px}.parallel-passage::-webkit-scrollbar-track{background:transparent}.parallel-passage::-webkit-scrollbar-thumb{background:var(--line);border-radius:999px}.parallel-passage.flow{flex:0 0 auto;min-height:0;overflow:visible;border-width:1px;border-radius:8px;box-shadow:none;padding:8px 10px;gap:6px}.lesson-scroll:has(.parallel-passage:not(.flow)){overflow:hidden}.parallel-turn{display:flex;gap:12px;align-items:flex-start}.parallel-turn .line .tl-w.is-live{color:var(--pink-dark);background-color:#9c1f2e1f;border-radius:4px;transition:color .16s ease,background-color .16s ease}.parallel-turn .speaker{flex-shrink:0;width:32px;height:32px;border-radius:50%;color:#fff;display:inline-flex;align-items:center;justify-content:center;margin-top:3px;position:relative}.parallel-turn .speaker.other{background:var(--color-brand);color:#fff}.parallel-turn .speaker.self{background:var(--color-brand-tint);color:var(--color-brand)}.parallel-turn .speaker svg{width:17px;height:17px}.parallel-turn button.speaker-play{padding:0;border:0;font:inherit;cursor:pointer;transition:transform .1s ease,filter .1s ease}.parallel-turn button.speaker-play:hover{filter:brightness(1.06)}.parallel-turn button.speaker-play:active{transform:translateY(1px) scale(.94)}.parallel-turn .content{flex:1;min-width:0}.parallel-passage .parallel-turn .content{padding-right:38px}.parallel-passage.flow .parallel-turn{gap:8px}.parallel-passage.flow .parallel-turn .speaker{width:24px;height:24px;margin-top:1px}.parallel-passage.flow .parallel-turn .speaker svg{width:13px;height:13px}.parallel-passage.flow .parallel-turn .line{font-size:14px;line-height:1.5}.parallel-passage.flow .parallel-turn .jp{margin:2px 0 0;font-size:12px;line-height:1.45;color:var(--muted)}.parallel-passage.compact{padding:10px 12px 12px;gap:8px;flex:0 1 auto}.parallel-passage.compact .parallel-turn{gap:8px}.parallel-passage.compact .parallel-turn .speaker{width:24px;height:24px;margin-top:1px}.parallel-passage.compact .parallel-turn .speaker svg{width:13px;height:13px}.parallel-passage.compact .parallel-turn .line{font-size:12.5px;line-height:1.45}.parallel-passage.compact .parallel-turn .jp{margin:2px 0 0;font-size:11.5px;line-height:1.45}.parallel-turn .line{font-size:15px;line-height:1.7;color:var(--ink);margin:0;font-weight:500}.parallel-turn .line .kw{color:var(--ink);border-radius:4px;transition:color .16s ease,background-color .16s ease}.parallel-turn .line .kw-hl-run{display:inline;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding:1px 3px;border-radius:5px;background:#b48a3e38;box-shadow:inset 0 0 0 1px #b48a3e59}.parallel-turn .line .kw.active{color:var(--pink-dark);background-color:#9c1f2e1f}.parallel-turn .line .kw.kw-formula{font-weight:700}.parallel-turn .jp{display:block;margin:6px 0 0;font-size:13px;line-height:1.75;color:var(--muted);font-weight:500}.duo-title{font-family:var(--font-display);font-size:11px;color:var(--muted);font-weight:700;letter-spacing:.12em;text-transform:uppercase;margin:2px 2px 0;text-align:center}.lesson-phase-title{display:flex;align-items:center;justify-content:center;gap:12px;font-family:var(--font-display);font-size:15px;color:var(--gold-dark);font-weight:700;letter-spacing:.22em;text-transform:uppercase;margin:10px 0 8px;text-align:center}.audio-orb{flex-shrink:0;width:var(--button-height);height:var(--button-height);aspect-ratio:1 / 1;border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-brand);display:grid;place-items:center;font-family:var(--font-display);margin:6px auto;box-shadow:none;border:1px solid var(--color-brand);cursor:pointer;-webkit-user-select:none;user-select:none;transition:opacity var(--duration-fast) var(--ease-standard),background-color var(--duration-fast) var(--ease-standard),border-color var(--duration-fast) var(--ease-standard),color var(--duration-fast) var(--ease-standard)}.audio-orb.rec{border-color:var(--color-audio-active);background:var(--color-audio-active);color:var(--color-surface)}.audio-orb:hover:not(.rec):not(.muted):not(:disabled){border-color:var(--color-brand);background:var(--color-brand-tint)}.audio-orb.muted{background:var(--paper-2);color:var(--muted)}.audio-orb:active{opacity:.6}.listen-audio-bar{flex-shrink:0;display:flex;flex-direction:column;gap:4px;padding:7px 16px 6px;background:var(--paper);border-bottom:1px solid var(--line)}.listen-audio-bar .audio-orb{margin:0 auto 2px}.report-card .lesson-replay-compact{background:transparent;border-bottom:0;padding:0}.listen-audio-bar.is-compact .audio-orb{margin:0}.listen-transport{display:flex;flex-direction:column;gap:4px;align-items:stretch}.listen-transport .audio-orb{align-self:center}.listen-audio-bar.is-compact .listen-transport{flex-direction:row;align-items:center;gap:10px}.listen-audio-bar.is-compact .listen-transport .audio-orb{align-self:center;flex-shrink:0}.listen-seek-inline{flex:1;min-width:0}.listen-seek-timelabel{flex-shrink:0;font-size:11px;font-weight:700;color:var(--muted);font-variant-numeric:tabular-nums;min-width:32px;text-align:center}.listen-audio-bar .range-seek{height:16px}.listen-audio-bar .seek-time{margin:0;font-size:10px;line-height:1.2}.listen-speaker-strip{display:flex;justify-content:center;gap:8px;min-height:28px}.listen-scene{display:flex;flex-direction:column;gap:var(--space-3)}.listen-scene-title{margin:0;font-size:var(--text-lg);font-weight:var(--weight-bold);color:var(--ink);line-height:var(--leading-tight)}.listen-scene-image{border-radius:var(--radius-md);overflow:hidden}.listen-scene-image img{display:block;width:100%;height:clamp(112px,18vh,160px);object-fit:cover}.listen-stage 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.turn-avatar{width:28px;height:28px}.listen-audio-bar .turn-avatar svg{width:15px;height:15px}.listen-audio-bar .turn-avatar .turn-no{min-width:14px;height:14px;font-size:8px}.listen-audio-bar .turn-avatar.is-current{outline-width:1px}.duo-chip{display:inline-block;padding:5px 10px;background:#fff;border:1px solid var(--line);border-radius:999px;font-size:11px;color:var(--ink);font-weight:700;margin:2px 4px 2px 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